<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>Document</title>
</head>

<body>
    <button onclick="send()">发言</button>
    <script src="/socket.io/socket.io.js"></script>
    <script>
        let socket = io('http://localhost:7001');
        socket.on('connect', function () {
            console.log('连接成功');
            socket.emit('getAllMessages');
        });
        socket.on('allMessages', function (messages) {
            console.log(messages);
        });
        socket.on('messageAdded', function (message) {
            console.log(message);
        });
        socket.on('online', function (message) {
            console.log(message);
        });
        socket.on('offline', function (message) {
            console.log(message);
        });
        function send() {
            socket.emit('addMessage', { content: '你好' });
        }

    </script>
</body>

</html>